I do online marketing for a finance company. I'm still relatively new to SEO (black hat, at least) so I need some tips. We put about $100 towards a high-PR, contextual linkbuilding service last month that added our link to many (though I'm not sure how many) PR4+ sites. We have seen good results from it but that company is not offering a renewal of that package. Any other trustworthy services available for us (in our budget) that will provide high-PR, contextual links? We aren't a 'get rich quick' type site - we are an actual company so it is important we don't get blacklisted. Any tips? Thanks.